9929661 has 16 divisors (see below), whose sum is σ = 15204864. Its totient is φ = 5646384.

The previous prime is 9929659. The next prime is 9929663. The reversal of 9929661 is 1669299.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (9929659) and next prime (9929663).

It is not a de Polignac number, because 9929661 - 2¹ = 9929659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9929663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3726 + ... + 5808.

It is an arithmetic number, because the mean of its divisors is an integer number (950304).

Almost surely, 2^9929661 is an apocalyptic number.

It is an amenable number.

9929661 is a deficient number, since it is larger than the sum of its proper divisors (5275203).

9929661 is a wasteful number, since it uses less digits than its factorization.

9929661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320.

The product of its digits is 52488, while the sum is 42.

The square root of 9929661 is about 3151.1364616595. The cubic root of 9929661 is about 214.9371440558.

The spelling of 9929661 in words is "nine million, nine hundred twenty-nine thousand, six hundred sixty-one".